ISSUE-181: Last Call Comment: Non Assignable Concepts
http://www.w3.org/2006/07/SWD/track/issues/181
Raised by: Sean Bechhofer
On product: SKOS
Raised by Michael Panzer [1]:
1. Non-assignable concepts
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Classification systems usually contain objects that are, while not being
assignable concepts, nonetheless an integral part of the system (not
just a display/presentation device), e.g., number spans or - in case of
the DDC - so-called "centered entries":
T2-486-T2-488 Divisions of Sweden
333.7-333.9 Natural resources and energy
A centered entry represents a subject covered by a span of numbers.
Centered entries relate notationally coordinate classes together as a
single concept. For example, T2-485 represents Sweden; the centered
entry T2-486-T2-488 represents the geographic divisions of Sweden.
Centered entries are an important part of the structural hierarchy,
representing true broader concepts, even though this superordination is
not indicated by notation. In addition, as they often contain
instructions applicable to all subordinate classes, centered entries
cannot be modeled as a skos:Collection, since skos:Collection cannot be
part of the concept hierarchy (as defined in 9.6.4). A new class or
expanded skos:Collection class is required to allow concept collections
like spans or centered entries to be expressed as concepts.
[1] http://lists.w3.org/Archives/Public/public-swd-wg/2008Oct/0061.html